Four Doors to Meeting for Worshipby William Taber. (This pamphlet describes the different levels on which we prepare for and experience silent worship. A good guide to deep and authentic worship.)

For an overview of Quaker testimonies:

An Introduction to Quaker Testimonies by American Friends Service Committee. (A brief introduction to peace, equality, integrity, community, simplicity, and earthcare with queries and pithy quotations.)

Quaker Ideals by Philadelphia Yearly Meeting. (A very brief collection of short statements expressing values common among Quakers.)

For nuts and bolts—more about how Quakers operate:

The Faith and Practice book of your yearly meeting. (These publications, sometimes called "disciplines," serve as guidebooks for members.)

Guide to Quaker Practice by Howard Brinton. (This booklet provides an overview of how the Friends community works--worship, structure, decision making, testimonies, and more. A bit dated, but still excellent.)

For historical perspective:

Friend: The Story of George Fox and the Quakers by Jane Yolen (A biography of George Fox. Though written for middle school students, the book provides an excellent, readable account of how Quakers emerged against the backdrop of religious turmoil and the English Civil War.)

Quakers in America by Thomas Hamm. (A concise, insightful history of how Quakers in the United States began, how they have changed over time, and what is happening among Quakers today.)